Timing Chain and Sprockets Removal

Tools Required

• J 8433  Two Jaw Puller. See Special Tools .
• J 41558  Crankshaft Sprocket Remover. See Special Tools .
• J 41816-2  Crankshaft End Protector. See Special Tools .
• J 42386-A  Flywheel Holding Tool. See Special Tools .

Fig 1: View Of Flex Plate & Bolts
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Do not apply threadlock to the flex plate bolts at this time.
1. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation .
Fig 2: View Of Special Tool & Bolts
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice .
2. Install the J 42386-A  (1) and bolts. See Special Tools . Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation.

   Tighten:  Tighten the J 42386-A  bolts to 50 N. See Special Tools .m (37 lb ft).

Fig 3: View Of Camshaft Sprocket, Sprocket Bolt & Timing Chain
Courtesy of GENERAL MOTORS CORP.
NOTE: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.
3. Remove and discard the camshaft sprocket bolt (206).
4. Remove the camshaft sprocket (205) and timing chain (208).
Fig 4: View Of Timing Chain Tensioner & Bolts
Courtesy of GENERAL MOTORS CORP.
5. Remove the bolts (231) and timing chain tensioner (232).
Fig 5: View Of Crankshaft Sprocket Special Tools
Courtesy of GENERAL MOTORS CORP.
6. Use the J 41816-2  (1), the J 41558  (2), bolts (3), and the J 8433  (4) in order to remove the crankshaft sprocket. See Special Tools .
Fig 6: View Of Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
7. Remove the crankshaft sprocket (207).
Fig 7: View Of Crankshaft Key & Keyway
Courtesy of GENERAL MOTORS CORP.
8. Remove the crankshaft sprocket key, as required.
9. Remove the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Removal .
10. Remove the J 42386-A  and bolts. See Special Tools .